Need help identifying this lens mount

[Roblam]

Hi all,

Can anyone identify this lens mount for me please? It's apparently a Canon mount but I'm not sure.

On the front is says 'Prakticar Auto T-73030557', and Google brings up no results for it.

Side view:

Top view:

Thanks in advance

 

[Roblam]

Ahha...I think I've found it myself, looks like an M42.

http://en.wikipedia.org/wiki/M42_lens_mount