Not sure I can link to FB here but there's a railboard for sale on the UK Stick FB group (nothing to do with me but if I see it's sold I'll revise the title here). If I had the spare funds I'd be very tempted but note the "if" at the start there.

Link to the post for FB-using bods: https://www.facebook.com/groups/ukstick ... 191242755/

[As ever, do due diligence, caveat emptor etc]

Edit: This is on ebay now (https://www.ebay.co.uk/itm/395891682149) and has a bid so I assume will be sold shortly. Title changed to reflect this.

For some reason I can’t see the serial number on the headstock on this Railboard. Also the zero fret looks different. Any ideas?

That worried me too but I think the serial number is engraved just below the flaps (same is true of pics on the SE website). It's hard to read but looks like 6623 (but other than the 2 any of those could be an 8 so 6823 or 6628 or similar).

Again, not my sale but I wondered as well and looked at the ones on SE (for instance the 'Nut' picture from the Railboard page)and the positioning is OK.

zero fret has velcro pad as damper.