Strap for Pennsylvania Tourbillon

The lug width of the RGM Grand Complications MM2 Steel is 19 millimetres. This measurement represents the distance between the two strap attachment points on the case. To measure accurately, position a calliper perpendicular to the line connecting the two lugs, measuring from the internal centre of one attachment to the other.

For a timepiece of this manufacturing calibre, we recommend alligator or shell cordovan leather with vegetable tanning. These materials emphasise the watchmaking heritage of the instrument and develop patina over time. Ideal colours are dark brown, cognac, or satin black. NATO fabric straps present a sportier alternative whilst remaining aesthetically coherent.

Strap replacement is performed using a spring bar tool. Locate the metal pins at the lug attachments, insert the tool beneath each pin to compress the internal spring, then withdraw the old strap. Insert the new strap's pin into the lug seat, release the tool, and verify the pin is securely locked. For inexperienced users, consult an expert at Atelier Casati Milano.

Yes, any quality strap with a 19mm lug width is compatible with the RGM Grand Complications MM2 Steel. The standard attachment platform permits immediate substitutions without structural modification. Always confirm the lug width is precisely 19mm for optimal alignment.

Leather strap durability depends on usage frequency, moisture exposure, and material construction quality. Under normal conditions, alligator or shell cordovan leather maintains structural integrity for 4-6 years. Periodic maintenance with appropriate leather creams and rotation between multiple straps significantly extends longevity.