OSCA 1600 GT half speed gear

One of the items that can become worn (if cam chains have not been properly serviced) is the teeth on the half-speed gear.  In restoring chassis 006, I purchased a spare half-speed gear with hang tag and part number (# 4046080).  Evidence of improper chain tension can be seen via grooves worn into the inner surface of the head.   Pictures of the gear are below:

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