The "Swan" only showed up in the 1928 Pequegnat Catalogue. It has and 8 day Time and Strike movement with a gong for the hours and the half hours. The clock measures 10 1/4 inches high, 19 1/2 inches wide and 5 1/4 inches wide. Check the label out and see that it says "Citadel" and that was crossed out and "Swan" was typed in.
This model comes up quite often for sale. Nice clock.