It looks like an “8” in the middle. I’d really like to see the rim behind the loops to determine whether the shell has dimples.   Here’s the issue: there is no fixed-loop shell configuration in the 900 lots. McCord fixed-loop runs span lot 25 to 796, give or take five lots. This particular fixed-loop style was used by McCord from about lot 40 to 188. However, the attachment method shown here looks slightly unusual, though not unprecedented. Dimples appear on all shells from lot 25 through 623. They result from the vise that held the shell in place while the rim was flattened.   Based on your new images, it could be a 98B, 98D, 98E, or 98F. Lifts higher than the F variant do not appear before approximately lot 825.

I realize that you are trying to help, however your last couple posts have created issues with inaccurate information.         

DSC 7630 was issued to Sgt. Anthony Scanlan Co. F 16th Infantry 1st Division from Lost Creek PA on 9/13/1919.   Mexico Service Medal 10888 issued to Anthony Scanlan.   You can find issue cards here (free): https://catalog.archives.gov/search-within/601682

Thanks all of you so much for helping me. I cannot believe how quick the response was. You folks are wonderful.

Victaulic Coupling?

3rd row...   Philippine Liberation medal with one campaign star, WW2 Victory, Armed Forces Reserve Medal

Army Commendation Ribbon with Oak Leaf Cluster indicating second award  Army Good Conduct Ribbon national defense service medal ribbon United Nations Service Medal Korea ribbon Korean Service Medal ribbon with two 3/16th inch stars show he served in two campaigns in Korea  philippine liberation medal ribbon with star WWII Victory Medal Ribbon Army Armed Forces Reserve ribbon American Defense Ribbon American Campaign Medal Ribbon Asiatic Pacific campaign medal ribbon with two 3/16th inch stars show he served in two campaigns in the pacific  Korean president Unit Citation  

3rd row down.. left most ribbon is WWII Philippine Liberation. Right most ribbon is US Armed Forces Reserve

Since you mentioned others would have an example but not you, does it have anything to do with the front windshield?   ...Kat

@blademan Sorry, it took awhile to download these 82 Marine Corps Muster Rolls on Arthur and I've put them all in an Adobe .pdf file you can send to the family.  Thanks...Matt US Marine Muster Rolls - Arthur G Stansbury.pdf