I’m looking for some help. I’m looking for a birth year watch 1974 and came across a 6263 that has all its links and in really good condition. The vid is $88k without box and papers. I need to verify the following but most of it checks out.

Case & Birth-Year Verification

• Serial Number: verify the first four digits of the serial number engraved between the lugs at 6 o'clock? (I am looking to confirm it falls cleanly into the 1974 production window).
• Engravings: Are you able to provide a clear, high-resolution photo of both the serial and reference number engravings between the lugs?
• Caseback: Does the interior of the caseback feature the stamped 6263 reference?

Dial & Component Condition

• Dial Originality: Is the "Sigma" dial completely original to this specific case, or is it a later service replacement? Are there any hidden surface scratches or blemishes not easily seen in the photos?
• Lume Integrity: Under UV/blacklight testing, are all of the tritium lume plots intact? Do the hands and dial plots react and fade uniformly under UV light?
• Bezel & Pushers: Are there any hairline cracks or micro-fractures in the black acrylic bezel insert? Are the screw-down pushers period-correct, or were they replaced during a later service?

Bracelet, Fit & Total Count

• Reference Numbers: What are the exact reference numbers stamped on the bracelet blades (e.g., 7835 or 78350) and the end links?
• Link Count & Wrist Fit: What is the exact total link count on the bracelet right now? My wrist size is 7.5 inches—will the bracelet accommodate this size as it sits, or is it currently missing links?
• Extra Links: If it is short, do you happen to have any authentic, period-correct 19mm links in your current inventory that could be added to complete the purchase?

Purchase, Warranty & Authentication

• Documentation: I note that the watch does not come with its original factory papers. Do you provide a formal, written Certificate of Authenticity from your firm guaranteeing the originality of the internal and external parts?
• Movement Service: When was the movement last serviced, what are the current time-grapher readings (amplitude/rate), and do you offer a mechanical warranty?

Is there anything else I should be asking? Also it’s vining from a chrono 24 dealer in Spain and has a 4.9 rating over 240 transactions