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Done my bit for the BBS: http://www.airgunbbs.com/showthread....-being-a-mod-… now I’m a game-keeper turned poacher.
Would like to know the serial number of the gun in the OP's post. Although there is some overlap with late Mk2s, the Mk3 began around 850000.
My working hypothesis is that Webley got (back) into .25" after the Patriot came out in 1993. And then experimented in export markets with a few Vulcans, Stingrays, Eclipses, Tomahawks in the same calibre. Either as a deliberate piece of marketing, or because they had a surplus of .25" barrels originally intended for the Patriot. Also missing the point that if they had offered them in the UK, (a) they would have sold a few, (b) they'd have got lots of free publicity in the gun press.
I think you are right about the export market. There were 2 or 3 .25 calibre vulcans at the webley historic auction. If I remember correctly they were short barrelled "ks" models and cheap as chips but you couldn't bid for them without a RFD ticket. I have a .25 tomahawk which I believe was destined for export market.