[bigblockv6]

It looks like someone made their own brackets mounted on top of the factory brackets as a wedge to hold the housing and also set a screw on top of the cluster to lock the clock in place. The clock I got dates to June 1962 it also didn't work so I sprayed a little WD-40 then it started working. As an alternative clock, Studebaker used one also in the early 60's I think in their "Hawk" other than a black bezel and less bolder numerals of the same font that clock was identical. I picked one up back in 1993 for about $20 at a swap meet and the seller had no idea what it was for, I bought it because it reminded me of the GMC/Borg clock. I'll post some pics of it later.