7 1/2" X 8 1/4" (190mm X 210mm)

(embossed ear side) 1-90 / HENDRIX / HP1-25VT

Picture courtesy Rick Soller

3 1/2" X 5 1/8" (190mm X 210mm) - Plastic insert

(one half embossed) PAT. NO. 4,134,574

(other half embossed) H.W.& C. VTST-1

Picture courtesy Rick Soller