Just remembered - Clifton make O1 blades and these are 3/16" thick ... same as the LN. I have one that I occasionally use in a LN #3.
Most of the time my LN #3 uses a PM-V11 Veritas Stanley Replacement blade as our local woods are not ideal for O1. Also, most of the time, my LN #4 1/2 runs the original A2 blade - it gets infrequent use, and the A2 blade has been fine.
Regards from Perth
Derek