There's surely more work to be done on both lists.
For merging duplicates please submit a Duplicates report to iflvico.
To rename printings, reply here with a command like:
UPDATE `colnect`.`zst_printing_translation` SET `name` = '[NEW_ENGLISH_NAME]' WHERE `zst_printing_translation`.`id` =[PRINTING_ID] AND `zst_printing_translation`.`lang` =0;
Example:
UPDATE `colnect`.`zst_printing_translation` SET `name` = 'Recess and Photo' WHERE `zst_printing_translation`.`id` =3 AND `zst_printing_translation`.`lang` =0;
My suggestion is to use the same standard for upper and lower case and combinations (choose if using + or and). NOTE: Rename only to make minor fixes (capital letters and typos) because your fix will be only in the English language. You should not rename one printing method to another.
To rename perforations, reply here with a command like:
UPDATE `colnect`.`zst_perforation` SET `name` = '[NEW_ENGLISH_NAME]' WHERE `zst_perforation`.`id` =[PERFORATION_ID] ;
Example:
UPDATE `colnect`.`zst_perforation` SET `name` = 'Comb 10½ x 11' WHERE `zst_perforation`.`id` =2686;
Here I suggest to use a strict naming standard so for example Comb 10½ x 11 has "Comb" with upper case C, then a space, then the numbers using fraction characters ( ½x ¼ ¾ and not 1/2 1/4 3/4) and separate the two number with an x that has spaces on both sides.