Seiko lord marvel is one of the high end watch for Seiko.
There is 2 main generation: low beat and high beat.
The 1st generation is low beat, and base on the "Seiko marvel" caliber.
The 2nd generation (5740 caliber) has 3 variants, A,B and C. The A and B is low beat, and last C is high beat.
The Variant A and B is hard to find (especially the B type).
C type is seiko first successful attempt to achieve 36000 beats movement.
High beat watch is less costly to regulate compare to low beat. And it is resist to fluctuations from external disturbances. However it require more precise of skill and craftsmanship.
All lord marvel variant is hand-winding mechanism (hand winding mechanism usually keep better time compare to automatic winding unless you forget to wind it). The second generation Lord marvel is design for water resistance/proof (of course all vintage watch its water proof mechanism is questionable...)
Hope this would help.