CNG Has some real variations for these: These two that came up in a row are 42-52grams. Both same size about.
Date
20.04.2016
Hammer
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Classical Numismatic Group, Inc., Electronic Auction 373, Lot 189
PTOLEMAIC KINGS of EGYPT. Ptolemy III Euergetes. 246-222 BC. Æ Tetrobol (37.5mm, 42.44 g, 12h). Alexandreia mint. Series 4. Struck 246-230. Diademed head of Zeus-Ammon right / Eagle standing left, head right, on thunderbolt; filleted cornucopia over shoulder, E between legs. Svoronos 974; SNG Copenhagen 224-6 (Ptolemy IV). VF, earthen dark green...
Date
24.08.2016
Hammer
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Classical Numismatic Group, Inc., Electronic Auction 381, Lot 242
PTOLEMAIC KINGS of EGYPT. Ptolemy III Euergetes. 246-222 BC. Æ Tetrobol (38mm, 52.44 g, 12h). Alexandreia mint. Series 4. Struck 246-230. Diademed head of Zeus-Ammon right / Eagle standing left, head right, on thunderbolt; filleted cornucopia over shoulder, E between legs. Svoronos 974; SNG Copenhagen 224-6 (Ptolemy IV). Near VF, brown patina.