Without the L just indicates it doesn't have the magnifier, so the crystal itself will work just fine.
Just a caution regarding using aftermarket or "alternative" crystals...the tension rings in Omega crystals often have a step in them that the dial seats into, and many aftermarket crystals do not. This means that if you use one of these aftermarket crystals, the dial and movement will be slightly further back in the case then it would be with an Omega crystal. This can cause a number of problems...
- the stem may not come out of the center of the case tube - this will eventually lead to stem failure due to work hardening, and also may increase wear on the movement plates and bridges
- the rotor may be more likely to scrape on the inside of the case back
- the edge of the dial may be damaged
I would recommend that you source an genuine crystal if at all possible.
Cheers, Al
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