Maurice Lacroix
strap · calf leather, brown
20/18
$234€215₴10 485indicative retail$325€299₴14 5631 of 1
Sheet 01 — factory catalog
Originalstraps forSwisswatchesOriginal strapsfor Swisswatches
Factory parts · mostly one of each
Legend · mm
Sheet stamp
- Time on the dial
- ··:··:··
- Movement beat
- 28 800 vph
- Position in stock
- 01/04
- On the drawing
- IWC · IWA11534
time on the dial ··:··:··position 01/04
Sheet 02 — new in the catalog
Sheet 03 — piece · IWA50223
Piece of the issue
IWC 24mm strap, crocodile, black
- brand
- IWC
- reference
- IWA50223
- width
- 24/18
- material
- crocodile, black
$343€316₴15 369indicative retail$650€598₴29 126
Open the piece
2 drawings · full specification · 1 of 1 in stock
Click to openSheet 04 — how to measure
How to measure a strap
Four measurements of the strap, and only the first is required; the fifth, L, belongs to the watch and is needed only for the fit calculation. The letters on the drawings below are the letters on the plate in the header and in every piece's specification.
changes · 10 s
Lay the rule on the 10 mark rather than on the zero edge, and subtract 10: the zero edge of most rules is worn, and that is a repeatable millimetre of error. A caliper is safer.
Legend
- Awidth at the watch
- between the case lugs, ruler across — not over the case and not over the dial
- Bwidth at the buckle
- across the narrow end of the shorter half — the one with the keepers
- Clength of the shorter half
- from the lug end to the end of the buckle half, clasp excluded
- Dlength of the longer half
- from the lug end to the tip of the perforated half
- Llug-to-lug
- along the strap axis, from the outer tip of the upper lug to the outer tip of the lower one. The strap itself does not count. Brand specifications call it lug-to-lug or L2L — often it can be looked up instead of measured
01
A — the one that is always needed
Width of the strap where it meets the case. This is the only measurement required every time. Measure between the lugs — not across the case, and not along the old strap if it has stretched or was never the right one.
Exception: cases with an integrated fitting — Royal Oak, Nautilus, Jorg Hysek and the like. There the width A is not enough: the strap end is shaped to that particular case. Send us the model before ordering and we will check it.
02
B — only if you are fitting a buckle
Width of the narrow end the buckle attaches to. Needed only if you are moving your own buckle across or taking a clasp from this catalog: it has to match B, not A.
03
C and D — so it sits on the wrist
Measure the wrist — on the arm, not over a strap. Then: C + D + L, where L comes from Fig. 1. That is the full length of the assembled strap. Leather closes on its own centre line, so the loop is longer than the circumference — on a 2.2 mm strap that is another 7 mm. What is left runs past the buckle as the tail, and the tail is what the holes adjust: 7 of them at 7 mm on a usual strap, and a tail wants to land between 28 and 78 mm — under that it does not reach the keeper, over it the tip runs into the other lug.
Calculate the fit
Set three measurements: A between the lugs, your wrist circumference and the watch's L — tip of one lug to tip of the other. The tool works out the range of C + D lengths those measurements ask for, and opens the catalog filtered to it.
Fit calculation — instrumentA 20 · 28 with lengths
Fig. 3 — assembled
Leather — the same C + D sum as below; hatching is the tail past the buckle, the blue hole is where the tang sits.
On the diagram: the pair your measurements ask for — not a piece from the catalog — with a 46 mm tail. The loop is 7 mm longer than the circumference: leather closes on its own centre line, not on the arm.
pair required, calculated: C 74 / D 110
The buckle is not in the sum: the tang sits on the same axis as the lug end of C, so the frame adds nothing. An unusual closure — a double deployant, or one with micro-adjustment on the clasp itself — is a different calculation again: write to us.
Closes on
mm
The same A as in Fig. 1: between the case lugs, not along the old strap. The marks on the scale are the widths that have whole straps with lengths behind them.
mm
A thread around the wrist, without pulling. Measure over the bone, where you wear the watch.
Measure on the arm, not over a strap — we add the thickness ourselves.
mm
The same L as in Fig. 1: from the tip of the upper lug to the tip of the lower one, along the strap. This is not the case diameter — on a classic lugged case L runs about 7 mm past it.
Your C + D range
167–208mm
optimum 184 mm — the pair to cut if you are cutting one; calculated for 2.2 mm of hide, and every extra millimetre of thickness adds 3 mm
Full length C + D + L
231mm
assembled strap on a head with L 47 mm; on your hole the tail comes to 46 mm
Straps in your size
By your measurements the C + D sum wants to be between 167 and 208 mm, with 184 the optimum. That is the span over which the strap can be fastened on a hole at all.
Sizes only. How a particular strap then sits depends on its thickness and on where its holes were punched — both are stated on the product sheet.
28 positions in stock at A 20 mm — the catalog opens with the filter set.
Sheet 05 — matching
Match to your watch
Make and model — we show the compatible parts in stock. Check the exact fit against the lug width in each piece's specification.
Matching by watchawaiting a query
Name the make and we will show the compatible parts in stock.
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- orders completed
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Orders and feedback counted from the shop’s eBay seller profile — open it and check. Last read 2026-07-26.
Shipping worldwide
Tracked and insured from Ukraine to the EU, the UK, the US, Switzerland, Japan and elsewhere. Transit is stated as a range, tracking is always provided, and import duties are payable by the buyer on delivery. Shipping terms.
What is in the catalog
Watch straps in alligator, crocodile, lizard and stingray, in calf, rubber and satin. Also single strap halves, steel and titanium bracelets, pin buckles and folding clasps. Lug widths from 13 to 35 mm.
Ukrainian too
The shop is in Ukraine and answers in English and Ukrainian. The Ukrainian version of this site is at grandstraps.com/ua.