Chris Davies’ Birmingham side had scored 12 goals in their past three home games but were largely second best during the opening half.
It took just 33 seconds for Albion to make their first mark on the game as Toby Collyer released the ball quickly into the path of Mikey Johnston, who spotted Isaac Price peeling off to the right and his angled rising shot sailed just over.
On-loan Manchester United midfielder Collyer was at the heart of Albion’s next incisive move, freeing Callum Styles down the left and the Hungary international cut into the box to fire in a right-footed shot which James Beadle parried away.
It was to be Collyer’s final contribution to the game – an injury forced him to be replaced by Ousmane Diakite just moments later.
The Baggies responded swiftly to the adversity as a quick throw into the box was nodded into the path of Mowatt, whose 20-yard low shot beat Beadle after deflecting against Christoph Klarer.
The lively Johnston threatened again before the break as his long-range effort just cleared the crossbar and Albion started the second half brightly with Aune Heggebo’s header saved by Beadle.
Price twice went close in quick succession, having found himself in plenty of space down the left-hand side on each occasion, but both times he sent the ball into the stand.
Birmingham began to come into proceedings and had a loud penalty shout waved away when Patrick Roberts’ low cross struck Johnston’s arm as the Albion man slid in to the block the cross.
The visitors drew level in the 78th minute when Tommy Doyle’s free-kick, some 30 yards from goal, was met with a deft Ducksch header that carried enough weight to clear a crowded penalty area and deceive goalkeeper Josh Griffiths.
Blues could have won it on 86 minutes when Roberts carried the ball from his own half and released substitute Kyogo Furuhashi, who turned and smashed his effort just over the bar.
Goalkeeper Griffiths twice had to come to Albion’s rescue late on – first from Tomoki Iwata’s strike, before reacting quickly to deny Furuhashi as the visitors ended the strongest.
