The nameplate on the front indicates that "initial current" in cyclic use can be 4.5A. Generally the chargers will start dropping current quickly, just due to Ohm's law. But you could cause irreversible gassing that doesnt recombine, which is deadly for this type of battery. So its better to use a lower rated charger just in case.
Id prefer one of the 0.8-2A chargers that is on the market. The NoCo latest temperature compensated 1A is a good option, and the BatteryMinder temperature compensated unit (1510, IIRC) is another. Both operate in different ways, and the NoCo doesnt actually float charge the battery, but unless its sitting in standby for long periods, that may not matter much to you.
Links:Noco 1ABattery Minder