I stuck one of these reference sites at the end of both lively .25ACP threads, but thought to post both it and another here, for the edification of all other suckers like myself who have trouble passing up cute little vest pocket guns for hurling lead.....
http://www.vestpockets.bauli.at/ is great for us dinky auto addicts, and if you hit the "archive" link on the left, it will pull up thumbnails by make/model which are clickable which show the guns assembled/field-stripped/disassembled along with description and production history in English (sorta) by clicking the "E" to the right of each model....
http://www.derringer.de/oldi.htm is another great site, which when a maker's name is clicked, will bring up a list of all models by that maker, each model name clickable for great close-up photos and production history/specifications (text in German, but production numbers are self-evident)....
both are great sites for IDing those oddball little poppers that turn up from time to time.....