Help to ID a frame

[KINGCUTTER]

Guys bought this on eBay on a whim I would ove to find out the maker the biggest clue must be the seat post the way it tightens it has super smoothe welds,just canti brake none disk,with the canti hanger loop,also has ritchey drop outs,it's never been built or painted,also the bottle holder bot hoes are diamond shape,not much info hope you can help.
The serial no begins with YM

Also it feels very light for chromoly

 

[jamabikes]

orange p7? need a few more pics though

 

[KINGCUTTER]

Here is another

 

[jamabikes]

not a p7

possibly a merlin, lancs not usa.

or a sunn

 

[GoldenEraMTB]

Moved you to retro chat; might get more input here

 

[one-eyed_jim]

It's probably a Merlin (UK) WCS from the mid nineties. Nice frame, and a good price:

http://www.retrobike.co.uk/forum/viewto ... ?p=1359897

Here's one with paint:

http://www.retrobike.co.uk/forum/viewto ... ?p=1083860