Russ has a 65 dash clock on eBay at an attractive price.

[elagache]

Dear mid-60s Buick owners who appreciate knowing the time,

Russ Martin of Centerville Auto Repair has a 1965 dash clock on eBay:

https://www.ebay.com/itm/Dash-CLOCK-Buick-Skylark-GS-Gran-Sport-Sportwagon-1964-1965-GM-300-401/362478818073

It doesn't have a knob and may not run.  However for $25 these are very hard to come by.  If your Buick didn't come with a clock or the clock was damaged, this could be a reasonable point of departure to restore that functionality.

Cheers, Edouard 

P.S. If you get these clocks converted with a quartz movement, they keep excellent time.