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The "MK25" is military designation.

The Navy with the SIG rail was designated the "MK24".

The first SEAL P226 was just the folded slided P226.

 

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As noted above, the MK25 has the 1913 rail. German frame or not has nothing to do with it.

 

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BTW, the two thousand NSW P226s, although made to the exact specs of the ones carried by the SEALs, were not made for the SEALs but to sell and raise funds for the Special Operations Warrior Foundation, with one of its missions being providing support and scholarships for the children of those special forces warriors who have given their lives for the country.

 

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Fyi, I'm copying and pasting the following post that Modern Day Savage, our resident expert on various "Navy" models over the Green site, made.
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"As I've typed up info for similar posts in the past, please excuse the cut and paste. Not knowing how much info you're looking for I've trimmed down some of the details.

The original SIG P226 Navy NSW model (P226-9-Navy) was released in 2004 as a limited run of 2000 no-rail guns.

After the original SIG P226-9-NAVY "NSW" model, the "Navy" model was added to the SIGARMS catalog and, over the years, have included various SIG Navy models that have changed in configurations and designators to include:

E26-9-NAVY (with a corresponding release of the contract over-runs). SOME of these were inadvertently released from SIGARMS with the original C.O.A.

E26R-9-NAVY (SIG proprietary accessory rail)

E26R-9-NSWG (SIG proprietary accessory rail)

E26R-9-NSWC (SIG proprietary accessory rail)

SIG MK 25 (1913 mil-spec picatinny rail)

SIG MK 25 OHT (1913 mil-spec picatinny rail)

Depending on how finely you want to split the hairs there have also been a number of special limited commercial releases, including the Trident.

The SIG "Navy" has, along with other SIG platforms & models, gone through a series of changes including rail, non-rail, phosphated internals- to non-phosphated internals- and back to phosphated internals, along with sight changes, mag changes, and even slide milling changes."

 

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Also, I’ve heard the “MK24” name get thrown around a lot for the SIG-rail P226 Navy, but I’m pretty sure the actual MK24 the US Navy is the HK45C.

It's thrown around, because it's both. And, the P226 MK24 was first.

Why Navy SEALs are Over the Beloved Sig Sauer P226 Pistol

Here’s What You Need to Remember: While Sig Sauer has created an excellent alloy-framed double action/single action pistol in the Mk 25, the general move to a striker triggers and the affordability of the Glock probably has doomed the Mk 25 to be a piece only for collectors and civilian marksmen...

nationalinterest.org

 

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Here are the real deals carried by the real SEALs. Images online and by SMG Lee.

 

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^^^ Older tech RFID button according to those who served.