eBay and Craigslist finds

to be honest i think there is nothing wrong with that frame, the angles look right, the forks angle is spot on. and have seen drop-outs like those on so called "proper" track bikes often enough.
i don't think it is a conversion.

and welcome paris.

You think its straight up murtle? I have never seen track ends like that why the funny angle? I'll give you that the angles look about right!