I found this Regina Extra Record Ti Freewheel in my bicycle parts box. My friend Kenny bought it in the early 80’s and I used it for a few miles and then put it in the parts box.
It is a six speed freewheel with 13-14-15-17-18-19 tooth cogs and Italian threading – 1.378″ x 24 TPI. When I recently removed the cogs to clean them, part of the freewheel body looked like it was made out of aluminum. All the cogs are threaded and made of titanium but I was unable to separate the last two cogs (18-19) from the freewheel body.
When I looked at the freewheel listings on VeloBase.com, I saw a Regina Extra Record freewheel that has aluminum cogs but I didn’t see an Extra Record freewheel with titanium cogs.
I checked eBay listings for titanium freewheels and there were several that sold in the $250-$500 range. That reminded me of the Steven Spielberg authored episode of Amazing Stories: Gather Ye Acorns.