Hi Brumfield,
If during servicing SONA (Swarovski Optik North America) replace the part with the original serial number, they assign a new number.
The new number has a different form than the original one - which explains the number on your unit.
(For details of the regular numbering that was in use until September 2020, see:
Swarovski's Alpha-Numeric Numbering Explained )
In relation to the replacement number on your SLC, the components are:
D - the same prefix as used for most of the original SLC production (excepting the early x30’s)
A - for SONA (A for America?)
90 - indicating that the work was done in 2020 (add 1930, as also with the original serial numbering)
12095 - the new sequential number
- - - -
In September 2020, new numbering patterns were adopted on all product lines, see:
Swarovski serialnumbers changed
Post #12 explains the new pattern used on regular production.
There is also a new form of replacement serial numbering.
An original production 7x42 SLC that’s been serviced since September 2020, has the new number DA12 11816C:
D - as before
A - (I’m not yet clear on this in terms of replacement numbering)
12 - indicating the year 2022 (add 2010, as with regular production from September 2020 on)
11816 - the new sequential number
C - for SONA (perhaps C for Cranston in Rhode Island where SONA is located?)
[C is also used for new production assembled by SONA i.e. some telescopic sights. In contrast, new production from Absam in Austria has an A suffix]
John