@Graeme:
My guess would be anything up to around 5" / 13 cm should sit inside a back pocket happily.
The original version of the Iron Heart / Manifold URA-02 had a ring for a lanyard. The new ones don't, but maybe Giles can get them fitted if there's another run done.
Self Edge (and Rivet and Hide) sell the Wild Child wallet in black and natural / tan.
Village Works sell a range of short wallets under the Redmoon and Pailot River brands. Take a look at Neolatine to see the range. There are a few extra bits and pieces on the Japanese version of their site.
E2ND sell Crow (Kurobane) wallets, which is an offshoot of Redmoon. Again, there's a few short wallets that have or can be fitted with leashes. There are also a few old stock Redmoon pieces you won't see on Neolatine.
Obbigood make short wallets, as do Herz.
I've missed a few, and I don't really know the American makers.
Thanks for links! Some good options there, but not quite what I'm looking for. Either are they too big, or the design is off. The OGL brave mid wallet could maybe work though, with some minor modification.
@Seth:
@johanhej:
…What are my alternatives as for wallets like this one?...
If you really like that wallet, you could buy that wallet. I believe it's made by Blackyrock in Elma, WA. Contact them and they'll make you one. I have one of their card holders and recognize the rein loop and construction. They make good products in the US at a discount compared to Japanese brands.
Edit: here's a similar one with that rein in tan from Blackyrock:
http://www.ebay.com/itm/blackyrock-wallet-Natural-vegtan-leather-coin-pouch-brass-ring-handmade-USA-/201053392193?pt=Wallet&hash=item2ecfb74d41
Yes I forgot to mention it's from blackyrock. I also found an alternative from Headers Co. which I really fancy. One of those with 4.75-5" length and room for 5-6 cards would be pretty spot on i think.
What kind of concerns me, is that I can't find much information about their work. I got an Angelos wallet and I'm really happy with that. How does it compare to the more known makers, like OGL, Angelos, Red Moon and maybe Iron Heart?
I'm located in Europe, so there's no real preference as for location of manufacturing. Best thing would be from Europe ofcourse, due to import costs, but I leather workers seem more rare around here.