Precancels on bee stamps

In some countrys (Belgium, France, Monaco, Canada, USA) the postadministrations sell stamps,  which are cancelled during the printprocess. They do that in view of concerns with a very big offer of printed matters (papers, magazines, etc.). The postoffice can work up quicker now. The cancellations look like surcharges. The French name for precancels is 'preobliteies'.       Monaco 1988 (see also 1989): the four seasons of the pear. On the spring-stamp flys a Bumble bee (Bombus terrestris).     Some precancels from Barbuda:

by Jan de Crom  
taken from "The Postal Bee" 1/1998 
Contact Group Bee Philately