Bubbles, Faded Lettering, And In MS Uncirculated 1988 Pennys

Hi Kawani, and welcome to the Forum!
1. The letters at the lower left of Lincoln's bust are VDB, for Victor David Brenner who originally designed the Lincoln cent.
2. In 1982, the U.S. Mint changed the composition of cents from 95% copper to 97.5% zinc with a thin copper coating. This unhappy marriage of metals often results in blisters, bubbles, and bumps.
3. When the dies used to strike coins approach the end of their useful life, many strange impressions can result. Also, grease applied to the dies can sometimes result in obscured or missing details in minted coins.
Hope that this quick reply will help you with your questions.
Best wishes and happy hunting!

to the Community!

Your post was moved to the appropriate forum for the proper attention.

Hondo covers your question quite well.
And very good questions they are too.

Can you post up full coin images (both obverse and reverse)?

Why do these devices appear as weaker? They are incuse on the coin. That means they are raised on the die. So any die polishing that affects that area of the die, will weaken or remove these raised devices on the die. Thus why some are weaker/missing off of the working die. (They are die events and not a premium for these cents.

CoopHome: Why can incuse devices be weakened? die polishing will affect these devices and weaken/remove these form the working die.