Please help ID my Steel Saracen frame

Measured the tube with my calipers and it's 29 mm diameter. There was a shim in when I got it, which says 27.2 to ??? (rubbed off unfortunately). At least I have a 27.2 post in my box.

Just noticed some digits stamped on the top of the square bridge section, again over painted so can't.be 100% but looks like H119115. Points to a 91 frame I guess but the Saracen serial numbers are a bIt random by all accounts.
 
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