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Vie:The MK25 and MK25AF are the sameit looks like the MK25 is sold under the MK25AF name in Europe. The MK25SA is a light weight stainless steel first stage that replaced the old (MK20UL etc.) Scubapro range of lightweight first stages.
The S600 Classic replaces the S600s plastic front cover, outer ring and adjustment knob with chrome plated brasssort of a retro Balanced Adjustable look. Scubapro claims superior performance in very cold water for the S600 Classic