Here is a nice RB250 from about 1963.Interesting things to note about this "Bowtie" are the Brazilian Rosewood fingerboard, and the full-thickness rim.
The rim has the appearance of 5 plies, but it actually is a 3-ply rim that has been "touched-up" with filler strips to cover up the glue joints. This tactic was also used on many Pre-war gibson rims to cover up cosmetic flaws in the glue joints. The guitar-like wide frets are also indicative of the late 50's and early 60's Mastertones.
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