simpson lawrence horizon 500 gypsy

[calviclassic]

I have aquired a S L horizon 500 and would like to know what size chain it accepts, I understand from looking online it is either 6mm or 7mm but cant find a definitive.
The only number on the gypsy is RC0760, does that mean anything to anyone?
TIA

 

[Malish]

Parts listing here, an e-mail from you may assist further

Parts for Horizon 500 | Simpson Lawrence Yacht Parts & Spares

 

[calviclassic]

thanks, I have already emailed I was just eager to find out