Hello,
When I purchased the pictured, pre-war 'Slant Grip' Webley Senior it included what I believed to be an original oil can although it wasn't confirmed that this was the case at the time of sale. Thanks to input from a fellow BBS member, I established that the can was actually a good replica but had subtle differences included by the original maker so that anybody knowing what they were looking at would know the difference. I have since sourced an original oil can and added to the set to make it correct, although obviously not original to the actual pistol at time of manufacture.
Post-war cans are hard enough to find, but these pre-war cans are much rarer and can easily be worth more than the pistols themselves.
http://i1362.photobucket.com/albums/...psjzkywtk0.jpg
http://i1362.photobucket.com/albums/...ps168d1a09.jpg
To answer your question, I'm aware of cased pistols from Cogswell & Harrison (Certus), Bedford & Walker (Eureka), Feinwerkbau (LP65), Parker Patent Precision (Crankwound), Walther (LP53), Westley Richards (Highest Possible), Eisenwerke (MF) and there are no doubt a few more of which I'm not aware.
Regards
Brian