... catalog.
I feel 30 mm must be the generic way of calling this collection. Regretably I don´t have the reference number for my watch, but its case diameter is 34,5 mm and its strap size is 18 mm.
As a matter of fact, the straps are not the original ones but a nice replacement. It is most possible the same in your catalog.
Thank you for sharing this info! Best cordial regards, Abel.