precanceler
Thank you for your reply and assistance. I managed to find additional copies in a mixed state on a strip of 4. Some of the stamps are perfect examples of an underinking on some letters and full ink on others within the same strip. The stamp from the original post:

Strip of 4 showing mixed states of inking:


In your post you mention L-16HS. What catalog are you using as a reference for types of precancels?