Escutcheon - Plain Thread

(Note: Measurements are outside max. dimensions unless stated otherwise).

18th Century : Plain thread escutcheon.

OUTSIDE
Height 18mm. (11/16")
Width top 10mm. (3/8")
Width base 9.5mm. (3/8")
Depth 3.5mm. (1/8")
Thickness (variable) 2mm. (1/16")

KEYHOLE
Height 14mm. (9/16")
Diam. of hole 6.5mm. (1/4")
Width at narrowest part of neck 5.5mm. (3/16")
Width at base of taper 6.5mm. (1/4")

Usually glued in or could be pinned from inside flange : 

Note: Irregular edges.