Now I'm not inferring that J. Lejeune had any part in it, but the concern did use the Crown over JL(last name 1st & 1st name last) so there were Liege mechanics that used the crown & they may have been older, established firms.

http://littlegun.be/arme%20belge/artisans%20identifies%20l/a%20lejeune%20j%20gb.htm

Kind Regards,

Raimey
rse