spikodelhyzer
Birdie Member
- Joined
- Jul 16, 2012
- Messages
- 472
It's the thumbtrac patent number.
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I'm sure it's on this thread somewhere, but I found a Teebird with no stamp saying whether it is an 11X or 12X. It's nice and beat with no name, and is a straight flyer. Is it just a nicely beat 12X or something else?
I just don't pay much attention to anything except how they fly.