Even if Tamarindo03's body is marked 54 it's clearly a post '59 styled body as evidenced by the 'hump' in the control cavity for the extra screw.
My ST-62DEX2 also has an 11-screw 60s-style body that's stamped as a '54.

Archetype_ST-62EX2_5


Archetype_ST-62EX2_8
