That is an older model BGE. The black vent has been replaced with a stainless one with a spark guard screen. It probably has the old scissor hinge instead of the newer spring hinge.
I have an old medium like that. You should be able to settle the bottom all the way down onto the nest although mine doesn't have the low cross brace between the legs, so maybe not?
Jim - Another transplanted Texan
Former KCBS CBJ
Large and Medium Big Green Eggs , Black 18.5" WSM, Blue Weber Performer - Stainless, Green Weber OTG Kettle , Brinkmann SnP Pro, and a Stainless UDS. One retired Portable Kitchen grill.
Red Thermapen, Maverick ET-732, EdgePro Apex Sharpener.
Avatar is the original 1951 Weber Kettle