The Arms
Blazon

Shield: Per Fess wavy Azure and barry wavy of six Argent, of the first a double-towered Castle or, in Chief on an Inescutcheon of the third a Lion passant guardant Gules.

Crest: On a Wreath of the Colours an Osprey rising holding in the Beak a Fish proper.

Supporters: Dexter: a Lion Gules gorged with a Mural Crown Or; Sinister side a Dragon Gules gorged with a Mural Crown Or.

Motto: Floreat Swansea

The Corporation of the County Borough of Swansea was granted its coat of arms in 1922, and was retained during subsequent local government reforms in which the City of Swansea became a district in the County of West Glamorgan in 1974 and a unitary City and County in 1996.

The unofficial 1863-1922 arms in seal form

Before 1922 the seal of the corporation contained a portculis, probably because it was a bage of the Somerset family, Lords of Gower, but from 1843 the Corporation also used a coat of arms supposedly based on a 16th century seal. This was similar to today's arms, but banners of the de Broes family (Lords of Gower in the 13th and early 14th centuries) flew from the towers and the shield in the chief contained an osprey rather than a lion.

This seal, sometimes shown in shield form, was not a legally-granted coat of arms, and in his 1905 book Armorial families Heraldic expert A.C. Fox-Davies mentioned Swansea as one of the offenders in strident attack on the use of unapproved "assumed" arms.

Gallery
The most commonly seen rendition of the arms
The arms on the war memorial.
Some older street signs carry the arms.
The arms appear on drainpipes on the Guildhall, with the motto replaced by the year 1932. but the inescutcheon (small shield above the castle) incorrectly shows two chevrons instead of a lion.
Another interpretation, on the former Swansea Technical College in Mountpleasant (now part of University of Wales Trinity St.David).
The arms at the Dylan Thomas Centre (the pre-1930s Guildhall).
A not-too-clear 1930s art deco version at Oystermouth Library (Mumbles).