This conversion set from Starfighter Decals is designed for the Monogram 1/72 F4B-4 (also issued under the Accurate Miniatures Label).

Installation instructions included.

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This 3 piece resin set allows the modeler to do a simple swap to backdate the Monogram F4B-4 kit to either the F4B-3 or the USAAC P-12E with or without the "Panama Kit".

Starfighter Decals 72-131 and 72-133 provide the markings designed for use with this conversion.

The instructions are clear and include images on what parts are for which conversion and what you need to do.  This is a well done set and will givve you what you need to accurately build these unique pre-war biplanes.