This watch has "10k R.G.P" stamped on the side below 6 o'clock. The 7AA movement stamped L3 puts this watch at a 1953. Almost all of the gold plating is gone, I believe it was chemically stripped off when the watch was left for dead due to a mangled hairspring and no crystal. I have since repaired the hairspring so it at least runs, and cut a new acrylic crystal for it. I wasn't able to find much on this dial, I believe it was referred to as Harlequinn? I saw some adverts from 1953 branding this chequered dial as a "park lane" but I do not know Bulova's well and need help. Caseback is stainless, along with the band. The case serial number I listed are the only numbers I could find on the case back, which I found inscribed very faintly on the inside, so they could be servicing marks.
Movement and dial are from the Bulova Park Lane, but your case is not original and the caseback has been replaced with a non Bulova replacement.
When we have a watch like this we ID it as non-conforming.
Welcome. It was common in the 1950's to sell replacement kits for Bulova Watches. With many cases being gold filled and hard working Americans working during the boom years case got beat up fairly quickly. Jewelry stores had racks of replacement cases for different model Bulova movements. Many also had replacement dials with the works Movement under the word Bulova. Love the checkerboard dial.
1953 Non-Conforming.