The small one is also my oldest coin, a 1/24 electrum stater of Phokaia (now Foça, 20 miles west of Izmir). 6 mm, 0,69 gr. Dated about 600 BC. Obv. a seal, rev. incuse. The largest is a multiple dirhem of amir Nuh bin Mansur (976-997) of the Samanid dynasty, minted in Badakhshan, on the border of Afghanistan and Tajikistan. It measures 44 mm and weighs 9,19 gr. Album 1969. Mitchiner 723. Strange as it may seem, the Samanids were active business partners of the Scandinavians of the 9th and 10th century.
Okay I have took a rather different route with this as I have sold my largest Ptolemy recently, I have a chunk of obsidian found in the levant (not a coin but money at one point) and a silver 1/96th Miletos eye swirl coin on it, weighs about 0.10grams
Update: Here is my LARGEST and SMALLEST coins having a social gathering... Uh-oh... no social distancing here. Please note that both of these are stamped / hammered, coins. Neither are cast coins. Carthage AE 15-Shekel 45mm dia 7.5mm thick 102.6g vs Ionia AR Tetartemorion 4mm 0.13g diameter: 11 to 1 Weight: 789 to 1 AMAZING to me that the THICKNESS of this coin is almost TWICE the diameter of the Tetartemorion!!!