Help with Marin frame sizing

[Magpiegifts]

Calling all Marin experts. I'm trying to determine the size of my 94 Marin pine frs I'm attempting to sell. Just been informed that at the bigger end of the sizes they came in 19" and 20.5"
Mine is 49cm center of bb to center of the top tube
And a fraction over 20" center of bb to the very top of the seattube. Now would this be classed by Marin as a 19"?

What better place to ask than on retrobike.
T.I.A

 

[Magpiegifts]

Just been informed that it's classed as a 19" due to the fact it has a 155 mm headtube. The 20.5" frame has a 175 mm headtube. I bought it advertised as a 20" iirc.

 

[Tootyred]

Marin at that time measured c to c .....not c to t. Its a weird thing, but there you go.