without any philatelic value.
A personal opinion only. They may influence some members to go ahead and collect revenues. They have value.
If you must insist your opinion, then the Railway stamp you valued, is also a cinderella, using your opinion, the corollory suggests no value either.
All stamps deserve respect.
Why All Railway Parcel Stamps (including Belgium's) are Cinderellashttps://alphabetilately.org/TOC/RAILWAY-MAIL.html