M210908a
Fleur-de-lis above the interlocking initials "R" and "L" above "DRESDEN".
So far, I have not found any concrete evidence as to who "RL" actually refers to, or that this mark is German, as is often claimed. On the other hand, the addition "Jaccard's" or "Jaccard's Kansas City" is easy to explain: it points towards the Jaccard Watch & Jewelry Company, a successful high-end jewellery store established in 1888. It was bought out in 1901 and subsequently renamed Mermod, Jaccard & King in 1905.
An interesting iteration of this mark can be found in some Röntgen publications. Rather than clarifying the main (Dresden) mark and noting that the "AUSTRIA" addition was merely an unrelated Austrian decorative studio addition, his explanation of the mark could be misconstrued to suggest that the entire mark is Austrian, for which there is no evidence whatsoever (just as there is no evidence to suggest that it is German).
M210908a
Fleur-de-lis above the interlocking initials "R" and "L" above "DRESDEN".
M210908b
Interlocking "R" and "L" above "DRESDEN", without any addition at all.
M210908c
Interlocking "R" and "L" above "DRESDEN", here with "JACCARD'S" and "GES. GESCHÜTZT".
M210908d
Interlocking "R" and "L" above "DRESDEN", here with "JACCARD'S KANSAS CITY".
M210908e
Fleur-de-lis above the interlocking initials "R" and "L" above "DRESDEN" and "AUSTRIA" (item re-decorated in Austria).