If it's in the bag then it will be the Scotty Cameron Red X2, which was a 2004-6 release, or a Futura Phantom Mallet 2 from 2005; they won't be going anywhere as it's getting harder to find centre shaft putters. Currently got a Futura 5S in from 2017. MP25's are from 2016 I think, along with the H5's. Hybrids are the 2018 MP CLK and ST200 driver & fairways from last year.
I've stuck to the current occupants of the bag, but I've still got a full set of Maxfli Revolutions from 2002 tucked away as a travel set, and some older Mizuno MS-3's (I think) and persimmon woods which I must re-grip & introduce to Crow...
That would be my Mizuno MP20 HMBs. Purchased 5 weeks before lockdown in 2020! 🤦♂️🤣 Since July 2020, every other club replaced courtesy of Frazer Amey at Westerham GC, Matt Johns at The London Putting Academy (Royal Blackheath GC), Mizuno demo day at Hilden driving range and two trips to Precision Golf!
A lot of people saying that their putter is their oldest club and will never leave their bag, reminded me of @ScienceBoy who I've not seen for ages, in fact he last posted in March, anybody no what's happened to him?
It would be my 48 degree vokey wedge and odyssey two ball putter. Not changed them since I started golf again around 2012/13.
I looked at swopping the two ball for a truss putter. What a load of rubbish that was. Cannot believe I paid £60 for the vokeys.