Blueheavenfla, Glad you found it interesting! Actually, I just ran across that site the other day & I think it's interesting, too. Tonight I found the same info on Sew Classic's Blog about 99k's. Jenny says: 99K10 - Aluminum rather than iron head (not common)
99K13 - Electric portable with wooden cover or carrying case, knee control
99K16 - All metal (electric) portable with carrying case
99K17 - All metal (electric) portable with carrying case
99-31 Newer model with back tack abilities
185K- "modern" looking version of the 99-31. minty green, sleeker lines,
mechanically identical to the 99-31
The “K” in Model name indicates it
was made in Kilbowie, Scotland
Windblown, It sounds like it's a 31 if it can backtack but the tension assembly was replaced with an older, un-numbered one.
Last edited by path49; 06-06-2013 at 09:50 PM.