Whatever- it's a high zoot frame, cable guides and bottle bosses.
It's a 1981 or earlier bike based on the head badge holes, more than likely Reynolds 531 or Columbus- as those are the frames you'd spend the bank to put on the extra braze ons.
Was Columbus of this era rifled? If so- check the steerer tube.
The way to tell the difference between the x10 and x30 frames is check the distance from the tire to the seat tube- the longer stays are the x10.
__________________
*Recipient of the 2006 Time Magazine "Person Of The Year" Award*
Commence to jigglin’ huh?!?!
"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.