Piston Advice

Can anyone help me with the markings on this piston? It is a Model F 125, does the 4 in the photo mean that it is an oversize piston? The markings under the 52 seem to say OV/LE
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https://www.ilambretta.co.uk/forum/viewtopic.php?f=12&t=11218
Rob Miller wrote:Looks like a 52.4 piston. Measuring at the skirt would confirm this.