In re-signing Jerry Blevins and Fernando Salas last week, the Mets put the (apparently) finishing touches on what will go down as one of the odder offseasons in recent baseball history. To dumb it down:

1. They retained six players whom they could have jettisoned. They re-signed Blevins, Yoenis Cespedes and Salas as free agents; exercised team options on Jay Bruce and Jose Reyes; and extended a qualifying offer to Neil Walker, which the second baseman accepted.

2. They added zero players who provided value to another major league team in 2016. Tom Gorzelanny, whom they signed last week to a minor league deal, registered -0.5 wins above replacement for the Indians.

And so, barring a late import, the Mets will be embarking — unwittingly, for sure — on an intriguing experiment. They will be the first playoff team in the two-wild-card era (since 2012, in other words) to try to return to October without acquiring a single reinforcement of value from the outside.

That’s 10 playoff teams per year over five years, for a total of 50. The Mets are the only one of 50 to give this plan a shot.

Other teams have come close by making minimal changes. From my research, three clubs stood out for their minimalism: the 2013 Giants, 2013 Orioles and 2014 Reds.

The 2012 Giants won the World Series. The 2013 Giants’ most significant addition was outfielder Andres Torres, whom they reacquired from the Mets, but similar to these Mets, they also re-signed their own Jeremy Affeldt, Angel Pagan (whom the Mets gave up for Torres and Ramon Ramirez the prior winter) and Marco Scutaro. In 2013, the Giants finished 76-86, their only losing record since 2009.