Inscription: "UNDERWOOD'S / PATENT HIGH CHAIR / BABY PLATE" and "342" stamped incuse
Mark/Signature: Yes
Materials
Aluminum
Dimensions (inches)
1 (H) x 8.5 (Diam)
Dimensions (centimeters)
2.54 (H) x 21.59 (Diam)
Measurement Notes
Measurement taken from Shipkowitz book "The ABC's of ABC Ware": Diam. 8.37 / 21.3 cm.
AW measurements: H. 1.0", Diam. 8.5", Diam. of well opening 5.5".
Analysis for the donor recorded on a label on the underside of plate: Aluminum 94.5%, Silicon 4.5%, Beryllium.37%, Copper .26%, Iron .19%, Magnesium .1%, Arsenic .05%.
This needs to be verified.