Laval (Quebec, Canada)

The shade of the field on which the logo is placed is somewhere between off-white and buff. The oldest photo of the flag I have seen dates from 1976. According to the city website:

Laval’s emblem clearly illustrates the modernism of a fast-growing city. The set of cubes builds the "L" of Laval, making the insignia a logo as well and symbolizing Laval’s development. The colors also have an important significance. Purple traditionally symbolizes wealth; in a broader sense, in the insignia, it represents Laval’s great economic potential. Blue symbolizes the quality of life and development of a human city. As for the letters of Laval’s signature, they are joined together to evoke the merger of the 14 municipalities of île Jésus.

Close to 20 municipalities have existed on the island known as île Jésus. In 1965, after some local mergers, the fourteen remaining municipalities are merged into a single city: Laval. According to the city archives, at least thirteen former cities had a coat of arms, though it is not known whether or not some of them might have been used on flags.
Luc Baronian, 21 May 2005

I am contributing this image, because it is mentioned in the discussion of Laval University's banner of arms and is useful as a comparison point of how the Laval family arms were adapted for the university vs. the city.
Luc Baronian, 10 June 2005

There seems to be a Laval QC police flag next to the flags of Quebec and the RCMP behind the policewoman on this image from radio-canada.ca
Luc Baronian, 18 May 2007

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According to my notes, the flag is simply the shoulder badge in a golden wreath on a white field.
Marc Pasquin, 18 May 2007